Sine gauge



FIG. 1 is a top plan view of a sine gauge showing my new design.

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image thereof;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a sine gauge, as shown and described. 